Coffee extracting apparatus for extracting coffee essence with use of compressed air stored in an accumulator

Abstract

In a coffee extracting apparatus for extracting coffee essence from the coffee material within an extracting device (10) with use of compressed air generated in an air compressor (11), use is made of an accumulator (23) for accumulating the compressed air. The accumulator is connected to an air passage (12) which connects the extracting device with the air compressor. An air control valve (22) is disposed in the air passage and is for controlling flow of the compressed air to make the accumulator accumulate the compressed air.

What is claimed is: 
     
       1. A coffee extracting apparatus comprising an extracting device supplied with hot water for extracting coffee essence from coffee material to produce liquid coffee extract, an air compressor for generating compressed air, and an air passage connected between said extracting device and said air compressor for conducting said compressed air from said air compressor into said extracting device, said coffee extracting apparatus further comprising: an air control valve disposed in said air passage for controlling flow of said compressed air in said air passage;   said air passage having first and second passage portions, said first passage portion extending between said air compressor and said air control valve, and said second passage portion extending directly between said extracting device and said control valve; and   an accumulator connected to said first passage portion for accumulating said compressed air with control of said flow of compressed air by said air control valve and for supplying compressed air solely to said extracting device.   
     
     
       2. A coffee extracting apparatus as claimed in claim 1, further comprising a water control valve disposed in said extracting device for controlling supply of each of said hot water and said coffee material into said extracting device. 
     
     
       3. A coffee extracting apparatus as claimed in claim 1, wherein said extracting device comprises: a filter support for supporting a filter member which is for filtering said liquid coffee extract; and   a chamber wall for defining, in cooperation with said filter member, an extracting chamber to which said hot water, said coffee material, and said compressed air are supplied.   
     
     
       4. A coffee extracting apparatus as claimed in claim 1, wherein said extracting device further comprises a seal member inserted between said filter support and said chamber wall.